Analogue Recording Module

The Astech ARM (Analogue Recording Module) is a compact, self
contained, solid state recorder for collection of single and multi channel
sensor data. Sample rates may be set over a wide range, from 1 every 3
minutes to 10,000 per second, making the ARM suitable for both logging and
dynamic data capture applications.

The Astech A.R.M

Data Acquisition/Logging Module

Rugged and Compact

Self-Contained

Modified Custom Designs

Choice of Sensors and Recording Modes

In order to make the ARM adaptable to a wide range of sensors/transducers,
the input conditioning circuit board is in the form of a plug-in component,
available in 4 or 8 channel versions according to the transducer type.

For special requirements Astech will build a custom design board to suit a
particular type or combination of sensors at nominal cost.

Infra-Red Interface Simplifies Setup and Downloading

A high speed bi-directional infra-red link is used for communication between
the ARM and laptop/PC, eliminating cabling and the need to make any physical
connection. Valid operation of the link is indicated by LEDs on the
infra-red transceiver interface unit and the ARM.

■ Cable-free input of setup data and downloading of stored

■ An understanding of how electronic systems can be made to survive extreme levels of temperature, vibration and centrifugal loads.

■ Competence in mechanical design and production of transmitters and related components

Start Modes and Recording Options

Setup data defining the ARM operating mode is input via an easy to use graphical user interface, available for PC in Windows XP.

Select each input channel as Fast or Slow, select the sample rate for the fast channels, and select the relative rate for the slow channels. The software displays the maximum length log to fill the ARM
memory. The Start Mode sets how the log will be started.

Triggered Start Setup - the log will begin when input channels exceed the user set limits. Multiple channel triggers can be combined with a logical OR (so that any single channel can start the log) or a logical AND (so that all specified channels must trigger simultaneously to begin the log).

The start mode can also be set to Delayed - to start a specified time after the start command is sent, or Rolling - where memory is filled repeatedly until the log is stopped. If the log is started from the PC and not the handheld unit, then the time delay mode can be used to start the log at a specified date and time.

Downloading and Display of Measurement Data

Once the ARM memory is full or a stop command is received, its operating mode switches to standby to maximise battery life and the memory contents are stored until overwritten by a new record operation. Subsequent downloading of data into a laptop or PC is carried out by pointing the infra-red transceiver unit at the ARM and selecting the software download command. Downloading the 262,000 measurements from ARM memory to disc takes 55 seconds.

Start Modes and Recording Options

An important feature of the ARM is the ability to survive and function under hostile operating conditions. Suitability for a wide range of measurement environments is ensured by providing a choice of two types of housing - a lightweight ABS enclosure or an IP67 sealable Diecast enclosure

To simplify attachment of the ARM, an optional steel banding/mounting plate assembly is available. This may be used to attach the diecast enclosure version of the ARM to, for example, structural components, rotating shafts and rig frames.

Enclosures and Accessories to Suit the Operating
Environment

To simplify attachment of the ARM, an optional steel banding/mounting plate assembly is available. This may be used to attach the diecast enclosure version of the ARM to, for example, structural components, rotating shafts and rig frames.

Modified and Custom Designs

Illustrated is a custom design ARM for the measurement of strain and temperature on a conveyor belt whilst passing through a refrigerated section at -60°C. Internal heaters ensure that the battery is maintained within its working temperature range. Please contact Astech Electronics to discuss specific applications.

About

Astech Electronics Ltd was established in 1973 for the design and manufacture of rotary and short-range non-contact telemetry systems.